Insulator-joint.



w. T. GODDARD.

INSULATOR JOINT.

APPLICATION FILED APR-4| I916.

l/VVENTOR c 9 51 25 5% mwzeki/ffia MAW/K W I J65! fills ATTORNEYS Patented Dec. 25,1911

UNITED STATES WALTER T. GODDARD, 0F HAMILTON, ONTARIO, CANADA.

' INSULATOR-JOINT.

To aZZ whom it may concern:

Be it known that I, WALTER T. GODDARD, of Hamilton, Province of Ontario, and Dominion of Canada, have invented certain new and useful Improvements in Insulator- Joints; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the referencenumerals marked thereon.

My invention has for its object to improve the construction of insulators of the pin supported type, or of the general character employing two or more separate insulating sections or members, that are molded from suitable insulating material used for the purpose, and are then secured together to form an insulating unit. In a more particular aspect, the invention may be said to consist in uniting a pair of insulating sections without employing cement or similar binding medium, thus eliminating the disadvantages which accrue from cement hydration in structures of this sort A further purpose of the invention is to equalize the static field over the adjacent or meeting surfaces of the insulator sections, thereby adding greatly to the general efliciency of the structure from the standpoint of efiective insulation. To these and other ends the invention consists in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure l is a sectional view showing the application of my invention, in one of its forms, to an insulator of the usual type;

Fig. 2 is a detail sectional View of the joint, and illustrating a modification in which the sleeve-like connecting member is in two parts, which are joined together;

Fig. 3 is a view similar to Fig. 2, and illustrating a different means for joining the two parts of the connecting member;

Fig. 4 is a view similar to Fig. 3, and showing still another method of joining the two parts of the connecting member;

Fig. 5 is a detail view showing a further modified form of connecting member .for

securing together two insulating sections,

and

Specification of Letters Patent.

tion.

Patented Dec. 25, 1917.

Application filed April 4, 1916. Serial No. 88,813.

Fig. 6 is a similar view of an additional modification of the connecting member.

Similar reference characters throughout the several views indicate the same parts.

The invention as shown in the present embodiment which it will be understood is merely intended as illustrative of the underlying features of. my improvement, is adopted in connection with upper and lower insulator sections or portions 1' and 2 the lower section being provided with a dome shaped top or enlargement fitting within a corresponding opening in the upper sec- The structure thus far described is one of well known form in the insulator art and according to the usual practice, the different sections are united by a cementing medium which is filled in between and serves to connect the adjacent surfaces; In the present structure however, no cement is employed and the parts'are held together mechanically in a manner that insures a tightand rigid connection and furthermore prevents in large measure the formation between the sections of an electrostatic field, greater at one point of the surface of the insulator sections than at another.

In order to effect the necessary union between the sections of the insulator, I employ a sleeve-like connecting member having projections for engagement with cooperating recesses on the surfaces of the insulating members. in the form shown in Fig. 1, the connecting member is of integral structure and threaded as indicated at 3 to engage corresponding screw threads on the insulating sections. The sleeve-like connect ing member is preferably of metal in order to insure a close engagement with the sections and permit as rigid as possible a union between the sections.

In Fig. 2 the connecting member is shown as consisting of two sections 5 and 6 each securing together the sections of the two arrangement in which the connecting member includes two threaded portions 11 and 12 respectively, which are offset with relation to each other, and connected by central portion 13. The upper and lower insulating sections or members are threaded on their interior and exteriorsurfaces respectively to receive the threaded portions of the connecting member by which they are held rigidly together.

According to another modified arrangement as indicated in Fig. 6, the opposite surfaces of the insulating sectionsmay be cut away to form a recess, and threaded to receive a hollow metal sleeve such as 14, which is in tight engagement with both insulating sections and acts to hold them together.

The opposite adjacent surfaces of the insulating members are spaced from each other slightly,afi',ording an opening 15 betweenthem and it is desirable toprovide some means that will'cause an even distribution of the electro-static field over the surfaces of the walls bounding the space 15. For the accomplishment of this purpose, I cover the meeting surfaces of the insulating sections with a coating of conducting mate rial, preferably of metal, such as copper or aluminum. Such metal coating is applied in the form of a spray, according to the mamas known metal coating processes, and afiords surfaces 16 and 17 of conducting substance,

which serve effectively to prevent formation of an excessive static field at any given point on the surfaces of the insulating member.

18 designates a compression washer that may be'employed betweenthe meeting edges of the upper and lower insulating sections.

lclaim as my invention 1. An insulator comprising a pair of separate sections composed of insulating mate'- rial and including oppositely arranged spaced surfaces coated with conducting substance, and means for holding the sections together.

2. An insulator comprising a pair of separate sections formed of insulating material and extending-one within the other, the sections including opposite surfaces which are slightly spaced from each other and coated with a conducting substance, and means for holding the sections together.

3. An insulator comprising a pair of separate sections formed of insulating material and extending one within the other, the sections including opposite surfaces which are slightly spaced from each other and coated I with a conducting substance, and a metallic sleeve-like connectmg member cooperating with said sections and holding them together.

WALTER T. GODDARD.

Witnesses:

J. N. SAUNDERS, EDWARD W. IBQLEY. 

